ROS Services in Python

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Hi I create not ROS python code for the server and the client. But need some help in implementing the ROS part for both of them. The Server only need to print a message as a list starting with 3 numbers and then append a list of three elements (three integer numbers), first is from 1 to 10, and is the chip number , second 0 to 8 is the chip size and third is always 7. On the client side for the Chip number 1 and 10 the chip size should be 2 and third is 7. For the Chips number 2 to 9 Chip size is Random number between 0 and 8 and third number also always 7.

So I create non ROS code for the server and the client in python just need bit help in implementing it as a ROS Service. Here the server node first

!/usr/bin/env python3

from __future__ import print_function
import rospy
import numpy as np
from os import system
import time
import threading
from geometry_msgs.msg import Vector3
import time
import serial
import serial.tools.list_ports
from time import sleep
from std_msgs.msg import Float32
from std_msgs.msg import String

def led_service():
    print("Server Read Data:")

    list_1 =[1,0,7]
    list_2 =[2,1,7]
    list_3 =[3,2,7]
    list_4 =[4,3,7]
    list_5 =[5,4,7]
    list_6 =[6,5,7]
    list_7 =[7,6,7]
    list_8 =[8,7,7]
    list_9 =[9,8,7]
    list_10 =[10,8,7]

    var = [1, 2, 3] 

    var.extend(list_1)
    var.extend(list_2)
    var.extend(list_3)
    var.extend(list_4)
    var.extend(list_5)
    var.extend(list_6)
    var.extend(list_7)
    var.extend(list_8)
    var.extend(list_9)
    var.extend(list_10)

    print('message', var)

if __name__ == '__main__':
    rospy.init_node('set_led')
    led_service()

And here the client node

#!/usr/bin/env python3

from __future__ import print_function
from __future__ import print_function
import rospy
import sys

import numpy as np
from os import system
import time
import random
import threading
from geometry_msgs.msg import Vector3
import threading 
import time
import serial
import serial.tools.list_ports

from time import sleep
from std_msgs.msg import Float32
from std_msgs.msg import String

def led_client():
    led_number1 = 1
    led_number10 = 10
    led_number1_colour=2
    led_number10_colour=2

    random_colour = random.randint(0,8)

    led_number2_colour=random_colour
    led_number3_colour=random_colour
    led_number4_colour=random_colour
    led_number5_colour=random_colour
    led_number6_colour=random_colour
    led_number7_colour=random_colour
    led_number8_colour=random_colour
    led_number9_colour=random_colour

    var_client_request = [1, 2, 3] 

    list_1 =[1,2,7]
    list_2 =[2,led_number2_colour,7]
    list_3 =[3,led_number2_colour,7]
    list_4 =[4,led_number2_colour,7]
    list_5 =[5,led_number2_colour,7]
    list_6 =[6,led_number2_colour,7]
    list_7 =[7,led_number2_colour,7]
    list_8 =[8,led_number2_colour,7]
    list_9 =[9,led_number2_colour,7]
    list_10 =[10,2,7]

    var_client_request.extend(list_1)
    var_client_request.extend(list_2)
    var_client_request.extend(list_3)
    var_client_request.extend(list_4)
    var_client_request.extend(list_5)
    var_client_request.extend(list_6)
    var_client_request.extend(list_7)
    var_client_request.extend(list_8)
    var_client_request.extend(list_9)
    var_client_request.extend(list_10)

    var_client_request.append(58)
    var_client_request.append(13)
    var_client_request.append(10)

    print('message', var_client_request)

if __name__ == '__main__':
    rospy.init_node('set_led')

    while not rospy.is_shutdown():
        try:
            led_client()
        except Exception as e:
            print(e)

Any help would appreciate Thanks